How to separate RGB values of an image?

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Jessica - 2020-09-30T09:50:36+00:00
Question: How to separate RGB values of an image?

We know that each pixel i in the input image I has rgb colors. My question is how to store them in a 3-vector Ii. Each color is being represented using a 64-bit floating-point number scaled to between 0 and 1.

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    • Expert Answer

    Profile picture of Prashant Kumar Prashant Kumar answered . 2025-11-20

    Sean de has told you how to get each plane, but it sounds like you want some kind of vector. I am not sure what you mean by a 3 vector, but here are a couple of guesses.
    If you want 3 vectors:
     
    R = reshape(I(:,:,1),[],1);
G = reshape(I(:,:,2),[],1);
B = reshape(I(:,:,3),[],1);

    Now if you want them all together in a 3 column vector:

    V3 = reshape(A(:),[],3) % R is first col, G is second col, B is third.


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